Too many weeds/plants can use some O2 use/loss while decaying at years end or something such as leaving the dead removed plants in the water.
The good bacteria will handle a good load of this without a crash under "normal" conditions especially in cooler water.
YP tolerate much lower water quality than many species and can handle lower DO than most but that doesn't mean they prosper in those conditions. Always good to manage water quality when able.
Last edited by Snipe; 08/08/19 11:15 PM.
